Place pitted dates in a microwavable container and cover with one cup of water. Microwave on high for 3 minutes, then let stand for 5 minutes.
Meanwhile peel garlic cloves. Strain the soaking liquid from dates, and reserve. In a mini food processor, pulse together the dates and garlic. Add approximately ¼ cup of liquid the soaking liquid a bit at a time, and pulse until a paste-like consistency is achieved.
Add oregano, vinegar, olive oil, black pepper, and kosher salt to the processor and pulse until combined. Empty contents into a large bowl. Stir in prunes, olives, capers and juice, and bay leaves.
For my recipe I used two packages of organic chicken parts with bones and skin, but you could quarter two small chickens if you prefer. I like to chop the chicken breasts into more manageable pieces, halves or thirds depending on the size of your chicken. Wash and pat dry the chicken pieces, then salt and pepper to taste.
Add chicken to the bowl with the marinade and toss to combine. Cover and marinate overnight in the refrigerator.
Arrange chicken in a single layer into two large, shallow baking pans (or one pan if you are halving the recipe). Spoon marinade over the chicken evenly. Add 1/2 cup of white to each pan, pouring around the chicken and being careful to not wash away the marinade on the tops of the chicken.
Bake for 50 minutes to 1 hour in a 350 degree oven. Baste every 15 minutes or so, with pan juices. In the last ten minutes of baking, I like to drain and reserve most of the pan juices, and baste the chicken one last time. This helps the skin to get crispy and brown.
Chicken is done when thigh pieces, pricked with a fork at their thickest, yield clear yellow (not pink) juice.
With a slotted spoon transfer chicken, prunes, olives and capers to a serving platter. Discard bay leaves. Sprinkle chicken with parsley, and serve with the pan juices in a gravy boat on the side.